[AMRadio] Stealth Antennas?


Bob Macklin macklinbob at msn.com
Mon Jan 24 17:43:06 EST 2005


It's in my 2002 handbook also. ONE little short paragraph! LOL!

Right after the expanations of trap antennas. If my noise situation gets to
the point I think I might be able to work 80M I will look at putting a
loading coil in my 40M antenna.

Thanks,

Bob Macklin
K5MYJ/7
Seattle, Wa.

"REAL RADIOS GLOW IN THE DARK"

----- Original Message ----- 
From: "Edward B Richards" <zuu6k at juno.com>
To: <amradio at mailman.qth.net>
Sent: Monday, January 24, 2005 2:28 PM
Subject: Re: [AMRadio] Stealth Antennas?


> Hi again, Bob;
>
> My 2003 ARRL Handbook mentions them on page 20.7. It states that the ARRL
> Antenna Book shows how to design them. Good luck.
>
> 73, Ed Richards K6UUZ
>
>
> On Mon, 24 Jan 2005 13:51:36 -0800 "Bob Macklin" <macklinbob at msn.com>
> writes:
> > Ed,
> >
> > Thanks for the link. Of all the books I have this option is not
> > covered. And
> > there is no reason it won't work. It just makes the tranmiter more
> > happy. It
> > won't improve receiver sensativity. It takes real area for that
> > problem.
> >
> > I understand base loading for the lower HF bands but center loading
> > is
> > common for 10M and higher. That's why I was considering it.
> >
> > Also you can bend a wire antenna but should have at least 1/8W from
> > the
> > feedpoint before the bend.
> >
> > Bob Macklin
> > K5MYJ/7
> > Seattle, Wa.
> >
> > "REAL RADIOS GLOW IN THE DARK"
> >
> > ----- Original Message ----- 
> > From: "Edward B Richards" <zuu6k at juno.com>
> > To: <amradio at mailman.qth.net>
> > Cc: <glowbugs at piobaire.mines.uidaho.edu>
> > Sent: Monday, January 24, 2005 1:20 PM
> > Subject: Re: [AMRadio] Stealth Antennas?
> >
> >
> > > Hi Bob;
> > >
> > > Base loading a mobile whip allows for taping the coil for a better
> > > impedance match.
> > >
> > > You certainly can use a loading coil in the center of a long wire
> > or wire
> > > HF antenna. It is quite common to do so. There used to be someone
> > who
> > > advertised center loading coils for HF antennas. I have not seen
> > an ad
> > > recently. Spi-Ro MFG, inc   www.spiromfg.com    offers shortened
> > antennas
> > > for some of the amateur bands. Also just the "shorteners". It is
> > easy to
> > > make your own. Get a couple of one foot pieces of 1-1/4 PVC pipe
> > and some
> > > varnish insulated # 14 wire and wind your own. Good luck.
> > >
> > > 73, Ed Richards K6UUZ
> > >
> > >
> > > On Mon, 24 Jan 2005 12:38:02 -0800 "Bob Macklin"
> > <macklinbob at msn.com>
> > > writes:
> > > > I live in a senior apartment where I CANNOT have an outdoor
> > antenna.
> > > > So I
> > > > have a wire around the wall at the base of the ceiling. It is
> > > > currently 1/4W
> > > > 40M antenna.
> > > >
> > > > I did buy the ARRL book on "Stealh Radio".
> > > >
> > > > HF mobile antennas use loading coils to make the antenna look
> > > > longer. The
> > > > better one us a coil in the center of the antenna.
> > > >
> > > > Some apartment antennas are nothing but a mobile whip with a
> > base
> > > > loading
> > > > coil. Why BASE LOADING?
> > > >
> > > > But the real question is why not use a loading coil at the
> > center of
> > > > a long
> > > > wire or dipole to make it look longer? The original Heath
> > Antenna
> > > > Tuner was
> > > > just a loading coil("L" section) that allowed use of a SHORT
> > wire
> > > > with the
> > > > small Heath transmitters. The DX-20 through DX-40.
> > > >
> > > > Bob Macklin
> > > > K5MYJ/7
> > > > Seattle, Wa.
> > > >
> > > > "REAL RADIOS GLOW IN THE DARK"
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